Alexei Volkov
Plastic pollution is a pressing issue that has been threatening wildlife for decades. Birds, in particular, are highly susceptible to the harmful effects of plastic waste. They often mistake plastic debris for prey, leading to ingestion of toxic chemicals and physical damage to their digestive systems. The presence of plastic in their diets also impacts their kidney function, cholesterol, and enzyme levels. Additionally, plastic pollution causes entanglement, which impairs birds' ability to hunt, escape predators, and care for their young. The accumulation of plastic in the environment, both on land and in aquatic ecosystems, poses a significant threat to the survival and well-being of various bird species.
| Characteristics | Values |
|---|---|
| Birds' vulnerability to marine litter | Affected by the foraging behavior, diet, breeding, molting, and distribution of the species |
| Plastic ingestion | In the 1960s, less than 5% of birds were found with plastic in their stomachs; in the 1980s, 90% of examined Laysan albatross chicks had plastic in their upper gastrointestinal tract; in 2015, a study found that up to 90% of seabirds had plastic in their stomachs; by 2050, 99% of seabird species are projected to be ingesting plastic |
| Plastic in the environment | Plastic is typically light and buoyant, making it easy to travel by gutter, stream, or river to the coast; it does not decompose easily and can remain in the environment for thousands of years |
| Plastic toxins | Plastic pellets attract toxic chemicals like DDT and PCBs, effectively becoming poison pills; plastics can also leach endocrine-disrupting chemicals like biphenyl |
| Plastic entanglement | Abandoned fishing gear can trap seabirds, causing them to drown or become easy prey for predators; entangled plastic can also cut into birds' skin, causing infection and even limb loss |
| Physical damage caused by plastic ingestion | Plastic can pierce internal organs, cause intestinal obstructions, nutritional problems, infections, and metabolic alterations; it can also reduce the volume of the stomach, leading to starvation |
| Intergenerational transfer of plastic | Plastic ingested by adult birds is transferred to their young when they are fed; plastic ingestion has been linked to higher mortality rates in chicks |
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What You'll Learn
Plastic ingestion
The impact of plastic ingestion on bird populations is widespread and devastating. In the late 1980s, 90% of examined Laysan albatross chicks were found to have plastic in their upper gastrointestinal tract. Plastic ingestion has been linked to elevated mortality rates in these chicks, with dead birds containing an average plastic load of 76.7 grams per individual. Similarly, in Hawaii, higher amounts of plastic in the guts of Laysan albatross chicks have been associated with increased mortality.
The problem of plastic ingestion by birds is not limited to a single species. In a 2015 study, up to 90% of examined seabirds were found to have plastic in their stomachs. This issue is projected to worsen, with estimates suggesting that by 2050, 99% of seabird species will be ingesting plastic. The ingestion of plastic by adult birds also affects their offspring, as the plastic is transferred to the young during feeding. Chicks that ingest plastic are less likely to survive to adulthood due to the harmful effects of plastic on their health and development.
The presence of plastic in the environment, especially in marine ecosystems, poses a significant threat to bird populations. Birds mistake plastic debris for prey or food, leading to detrimental health consequences and even death. The impact of plastic ingestion on birds underscores the urgent need to address plastic pollution and find sustainable alternatives to protect bird species and their ecosystems.
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Entanglement
Plastic pollution is a significant threat to birds, and entanglement is one of the two main ways it harms wildlife. Birds can get caught in discarded fishing lines, nets, and other plastic items, which can restrict their movement, making it difficult for them to hunt, escape predators, and care for their young. The entangled plastic can also cause physical injuries, such as cuts, infections, and even limb loss.
Birds that nest on the ground or in low vegetation, such as waterfowl, shorebirds, and terrestrial birds, are particularly vulnerable to entanglement. They may become entangled in plastic debris while foraging for food or nesting materials. This can impair their ability to fly, walk, or swim effectively, impacting their survival and reproductive success.
Some birds, especially waterbirds, may become entangled in plastic waste while swimming or diving. Plastic rings from beverage containers or other plastic loops can constrict their bodies, causing injury or impairing their swimming ability. This can make them more vulnerable to predators or hinder their ability to catch prey.
The impact of entanglement can be both immediate and long-lasting. Birds may suffer from infections, limb loss, or reduced mobility, affecting their overall health and survival rates. Additionally, the presence of plastic debris in their environment increases the risk of entanglement, further endangering their populations.
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Nest-building with plastic
Common coots in Amsterdam's city centre, for example, incorporate plastic debris, such as plastic bands, between the twigs of their nests. These plastic bands can make the nests stronger and more durable. Additionally, plastic may help with heat regulation, keeping the nest warmer. In one case, researchers were able to date a coot nest back to 1991 using the expiration dates on the plastic waste incorporated into the structure.
Another study of two bird species breeding in a Mediterranean agricultural landscape found a high prevalence of plastic used as nest material. Eurasian magpies and European serins selected plastic filaments over other plastic debris, with almost 71% of European serin nests and 96% of Eurasian magpie nests containing plastic debris.
While plastic may offer some advantages to birds, such as easier access to nesting material and increased nest durability, it also poses significant risks. Chicks can choke on plastic, become entangled in it, or ingest toxins. Plastic may also introduce harmful parasites to the nest and expose birds to harmful chemicals. Additionally, brightly coloured trash may attract predators to the nest.
The presence of plastic in bird nests highlights the widespread problem of plastic pollution and its impact on wildlife. It serves as a reminder that the artificial materials we create are slowly replacing the natural world.
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Transfer of plastic to offspring
Birds are susceptible and vulnerable to environmental changes, and plastic pollution has had a substantial impact on them. Plastic waste and debris have accumulated in hundreds of terrestrial and aquatic avian species. The accumulation of plastic waste and debris in the environment has continuously increased, resulting in substantial environmental pollution.
Birds ingest plastic pieces that are both large and small, and will even regurgitate them for their offspring. This ingested plastic poses a lethal threat to birds as it distracts them from real food, leading to intestinal obstructions, nutritional problems, infections, and metabolic alterations. The ingested plastic also affects the reproductive output of birds.
The intergenerational transfer of plastic debris has been observed in several species of birds, such as the Cory's Shearwater, Providence Petrel, Black-footed Albatross, Laysan Albatross, Short-tailed Shearwater, Wedge-tailed Shearwater, Flesh-footed Shearwater, and other petrels.
Plastic pellets are magnets for toxic chemicals like DDT and PCBs, and they can leach endocrine-disrupting chemicals. These toxins can be transferred to the offspring through feeding, impacting their growth and development. Additionally, thread-like plastics are attractive to birds as potential nesting material, but this tangled plastic can then threaten both adult birds and their chicks.
Birds exhibit strong parental care behaviours, investing significant time and energy in feeding, protecting, and teaching their young. The transfer of plastic to their offspring, either intentionally or unintentionally, can have detrimental effects on the chicks' health and survival.
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Plastic pollution in oceans
Ingestion of plastic is another critical issue, with an estimated one million birds dying annually due to plastic ingestion. Seabirds, in particular, are vulnerable to ingesting plastic as they may mistake it for prey or fish eggs. Adult birds can inadvertently feed plastic to their chicks, leading to a higher mortality rate among younger birds. Additionally, the ingestion of plastic can cause physical damage to the birds' gastrointestinal tracts and affect their kidney function, cholesterol levels, and enzymes.
The presence of toxic chemicals in plastic further exacerbates the problem. Plastic pellets can absorb harmful substances like DDT and PCBs, becoming poison pills. These chemicals can leach into the birds' systems, causing endocrine disruption and severe health issues.
The impact of plastic pollution in oceans extends beyond the immediate harm to birds. It also affects their breeding, molting, and distribution patterns. Birds may use marine debris in their nest construction, incorporating fishing lines and synthetic ropes into their nests. Additionally, plastic pollution can alter the composition of litter over time, impacting the overall ecosystem.
Addressing plastic pollution in oceans requires collective efforts. Recycling, reusing, and reducing plastic usage are essential steps. Initiatives like beach cleanups and conservation programs play a vital role in mitigating the impact of plastic pollution on bird populations and the environment as a whole.
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Frequently asked questions
Plastic ingestion can cause physical damage to the stomach, resulting in a condition called "plasticosis". It can also lead to intestinal obstructions, nutritional deficiencies, infections, metabolic alterations, and damage to the gut. Additionally, the toxic chemicals in plastic can cause poisoning and affect kidney function, cholesterol levels, and enzyme production.
Birds often mistake plastic debris for prey or food. Some plastics resemble natural materials or fish eggs, and recent research suggests that plastic may develop food-like smells that attract birds. Once ingested, plastic can cause entanglement, making it difficult for birds to escape predators or care for their young.
Plastic ingestion has been shown to reduce the survival rate of chicks and cause physical abnormalities in adult birds. Birds that ingest plastic may have shorter wings and bills, lower body mass, and reduced reproductive success. Over time, this can have a significant impact on bird populations and biodiversity.
Reducing plastic pollution is crucial to minimizing its impact on birds. This can be achieved through recycling, reusing disposable items, and participating in trash cleanups to remove plastic from the environment. It is also important to avoid single-use plastics and support sustainable alternatives to reduce the amount of plastic waste that enters our oceans and affects bird habitats.
